An electronic variable speed drive has two basic sections: the control section and the power section.
Answer the following statement true (T) or false (F)
True
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Si un cable se identifica como 1.400 pies (427 metros) 34 pulg. (1,9 cm) 6 x 37 WS pref RRL EIPS FC, el alma del cable se indica mediante las letras _____.
a. WS b. pref c. EIPS d. FC
Column forms require strong tie supports and _____.
a. smooth liners b. steel strongbacks c. tight joints d. leveling jacks
OASIS® floral foam should not be used with evergreens
Indicate whether the statement is true or false
A student measures the spring constant k of a spring by loading it and measuring the extension. (According to Hooke’s law, if l is the load and e is the extension, then k=l/e.) Assume five independent measurements are made, and the measured values of k (in N/m) are 36.4, 35.4, 38.6, 36.6, and 38.0.
a. Estimate the spring constant, and find the uncertainty in the estimate. b. Find an approximate value for the uncertainty in the average of 10 measurements. c. Approximately how many measurements must be made to reduce the uncertainty to 0.3 N/m? d. A second spring, similar to the first, is measured once. The measured value for k is 39.3. Approximately how much is the uncertainty in this measurement?